<template>
  <div class="app-container">
 
    <!--查询表单-->
  <el-form :inline="true">
    <el-form-item>
    <!-- <el-input v-model="searchObj.name" placeholder="讲师名" /> -->
    <!-- value-key="name" 对应数据库的键 解输数据列表-->
    <!-- :trigger-on-focus="false" 点击不触发-->
    <el-autocomplete
         v-model="searchObj.name"
         :fetch-suggestions="querySearch"
         :trigger-on-focus="false"
         class="inline-input"
         placeholder="讲师名称"
         value-key="name" 
         />
</el-form-item>
  
    <el-form-item>
        <el-select v-model="searchObj.level" clearable placeholder="头衔">
            <el-option value="1" label="高级讲师"/>
            <el-option value="2" label="首席讲师"/>
        </el-select>
    </el-form-item>

    <el-form-item label="入驻时间">
        <el-date-picker
                        v-model="searchObj.joinDateBegin"
                        placeholder="开始时间"
                        value-format="yyyy-MM-dd" />
    </el-form-item>
    <el-form-item label="-">
        <el-date-picker
                        v-model="searchObj.joinDateEnd"
                        placeholder="结束时间"
                        
                        value-format="yyyy-MM-dd" />
    </el-form-item>
    <el-form-item>
        <el-button type="primary" icon="el-icon-search" @click="fetchData()">查询</el-button>
        <el-button type="default" @click="resetData()">清空</el-button>
    </el-form-item>
</el-form>

<!-- 工具按钮 -->
<div style="margin-bottom: 10px">
    <el-button type="danger" size="mini" @click="batchRemove()">批量删除</el-button>
</div>

    <!-- 表格 -->
  <el-table 
  @selection-change="handleSelectionChange"
  :data="list" border stripe>
    <el-table-column type="selection"/>
    <el-table-column type="index" width="50"/>
    <el-table-column prop="name" label="名称" width="80" />
    <el-table-column label="头衔" width="90">
        <template slot-scope="scope">
          <el-tag v-if="scope.row.level === 1" type="success" size="mini">高级讲师</el-tag>
          <el-tag v-if="scope.row.level === 2" size="mini">首席讲师</el-tag>
        </template>
    </el-table-column>
    <el-table-column prop="intro" label="简介" />
    <el-table-column prop="sort" label="排序" width="60" />
    <el-table-column prop="joinDate" label="入驻时间" width="160" />
    <el-table-column label="操作" width="200" align="center">
    <template slot-scope="scope">
      <router-link :to="'/teacher/edit/'+scope.row.id">
    <el-button type="primary" size="mini" icon="el-icon-edit">修改</el-button>
    </router-link>
        <el-button type="danger" size="mini" icon="el-icon-delete" @click="removeById(scope.row.id)">删除</el-button>
    </template>
    </el-table-column>

   </el-table>

   <!-- 分页组件 -->
<el-pagination
  @current-change="changeCurrentPage"
  @size-change="changePageSize"
  :current-page="page"
  :total="total"
  :page-size="limit"
  :page-sizes="[5, 10, 20, 30, 40, 50, 100]"
  style="padding: 30px 0; text-align: center;"
  layout="total, sizes, prev, pager, next, jumper"
/>
  <el-table-column
  label="#"
  width="50">
  <template slot-scope="scope">
    {{ (page - 1) * limit + scope.$index + 1 }}
  </template>
  </el-table-column>

  </div>
</template>
<script>
import teacherApi from '@/api/teacher'
export default {
  // 定义数据模型
   data() {
     return {
       list: [] ,// 讲师列表
       total: 0, // 总记录数
        page: 1, // 页码
        limit: 10, // 每页记录数
        searchObj: {},// 查询条件
        multipleSelection: [],// 批量删除选中的记录列表

    }
  },

  // 页面渲染成功后获取数据
  created() {
    this.fetchData()
  },
  

  // 定义方法
  methods: {
   fetchData() {
    // 调用api
    teacherApi.pageList(this.page, this.limit, this.searchObj).then(response => {
        this.list = response.data.rows
        this.total = response.data.total
        })
      },
      // 每页记录数改变，size：回调参数，表示当前选中的“每页条数”
    changePageSize(size) {
    this.limit = size
    this.fetchData()
      },
      // 改变页码，page：回调参数，表示当前选中的“页码”
    changeCurrentPage(page) {
    this.page = page
    this.fetchData()
     },  
     // 重置表单
    resetData() {
    this.searchObj = {}
    this.fetchData()
     },
     // 根据id删除数据
  removeById(id) {
    this.$confirm('此操作将永久删除该记录, 是否继续?', '提示', {
        confirmButtonText: '确定',
        cancelButtonText: '取消',
        type: 'warning'
    }).then(() => {
        return teacherApi.removeById(id)
    }).then((response) => {
        this.fetchData()
        this.$message.success(response.message)
    }).catch(error => {
        console.log('error', error)
        // 当取消时会进入catch语句:error = 'cancel'
        // 当后端服务抛出异常时：error = 'error'
        if (error === 'cancel') {
            this.$message.info('取消删除')
        }
     })
    },
    // 批量删除
batchRemove() {
  console.log('removeRows......')

  if (this.multipleSelection.length === 0) {
    this.$message.warning('请选择要删除的记录！')
    return
  }

  this.$confirm('此操作将永久删除该记录, 是否继续?', '提示', {
    confirmButtonText: '确定',
    cancelButtonText: '取消',
    type: 'warning'
  }).then(() => {
    // 点击确定，远程调用ajax
    // 遍历selection，将id取出放入id列表
    var idList = []
    this.multipleSelection.forEach(item => {
      idList.push(item.id)
    })
    // 调用api
    return teacherApi.batchRemove(idList)
  }).then((response) => {
    this.fetchData()
    this.$message.success(response.message)
  }).catch(error => {
    if (error === 'cancel') {
      this.$message.info('取消删除')
    }
  })
},// 当多选选项发生变化的时候调用 selection//表格中被选中的值
handleSelectionChange(selection) {
    console.log(selection)
    this.multipleSelection = selection //把表格中被选中的值赋值
} ,
//输入建议  calback 回调函数 queryString 输入关键字
querySearch(queryString, calback) { 
    teacherApi.selectNameListByKey(queryString).then(response => {
        calback(response.data.nameList)
    })
}

   }
}
</script>
